@mixin bg-set($width, $height, $type:inline-block){
  display: $type;
  width: $width;
  height: $height;
  background-repeat: no-repeat;
  background-position: center center;
  background-size: $width $height;
  margin-top: -.04rem;
  vertical-align: middle;
}

@mixin bg-img($url) {
  background-image: url($url+"@2x.png");
  @media only screen and (-webkit-device-pixel-ratio: 3) and (-webkit-device-pixel-ratio: 3) {
    background-image: url($url+"@3x.png");
  }
}